Core plug



1941- c. M. RICHARDSON 2,231,140

CORE PLUG Filed June 12, 1959 INVENTOR ATTORNEYS Patented Feb. 11, 1941UNITED STATES;

PATENT o-F-Flcs 1 Claim.

The present invention relates to new and improved core plugs or bushingsfor roll material.

Materials such as paper, when manufactured are wound on a core whichcore may be formed of wood, paper or other composition. .When saidmaterials are to be converted into a finished prod uct, the core andmaterial are connected with the converting machine by being placed on ashaft of said machine which extends through the core permitting thematerial to unwind as; it is fed into the machine. Quite frequently, thediameter of the core is greater than the diameter of the shaft of theconverting machine'with the result that r the core does not rotate inunison with the shaft. When this occurs, there is a possibility of thecore rotating faster than the shaft causing improper feeding of thematerial to the converting machine.

An important object of the invention is, therefore, to provide a coreplug or bushing adapted to be placed on the shaft of a convertingmachine for uniting the same with the core and material supportedthereon.

A'further object of the invention resides in the provision of novelmeans for locking the core plug or bushing in engagement with the shaft.

A still further object of the invention resides in the provision of acore plug or bushing having spirally formed threads thereon Which willbite into the material of which the core is formed as the core plug isplaced over the shaft between the same and the core.

The invention will be fully and comprehensively understood from aconsideration of the following detailed description when read inconnection with the accompanying drawing which forms a part of theapplication.

In the drawing:

Figure 1 is essentially a vertical sectional view with parts inelevation illustrating the device in use.

Figure 2 is a side elevational view of the locking plug.

Figure 3 is a front end elevational view of the tapered core plug.

Figure 4 is a front elevational view of the lock ing plug, and

Figure 5 is a side elevational view illustrating the device in use.

Referring to the drawing for a more detailed description thereof,-thereis disclosed a roll of paper or similar material 8 wound upon a core I,said core being formed of heavy fiber stock, wood or other composition.When the roll of material 6. is to be converted into a finished product,it is placed on a shaft 8. to be fed into a converting machine, theshaft 8 being generally smaller in diameter than the core 1.

The core plug generally designated by the reference numeral 9 isdisposed over the shaft 8 on each. end thereof and is wedged betweensaid shaft and the core I. The core plug 9 is formed with a central boreI 8 of a size to permit slipping said plug over the shaft 8 and bringingit up into position to screw into the core I. The core plug 9 maybeformed of iron or similar material being tapered inwardly indicated atH, and the exterior portion thereof formed with tapered spiral threadsl2. As more clearly shown in Figure 1 of the drawing, the taperedportion of the plug on which the tapered spiral threads are formedbegins with the inner portion of the collar l3 and extends toward theend of the plug.

A multiplicity of spaced openings 14 are formed circumferentially of thecollar l3 for receiving a spanner wrench or the like used in applyingthe plug to the core. As aforeindicated one of the plugs 9 is disposedover each end of the shaft 8 and with the use of an appropriate tool isscrewed inwardly between the shaft and the core with the threads l2biting into the core I. It may be possible to tighten the plugsufiiciently for it to be substantially flush with the end of the rollor it may extend away from the'same as shown in Figure 1 of the drawing.The plug is tightened, however, until binding action is obtainedwhereupon the core 1 will be caused to rotate with the shaft 8 throughthe medium of the core plug 8.

Means is also provided for locking the core plug 9 on the shaft 8, thelocking plug being generally designated by the reference numeral l5 andcol prises a collar I6 and stem H, the stem I! being centrally bored asindicated at 8 so as to fit over the shaft 8. The collar 9 iscounter-bored as indicated at l9 for receiving the stem ll, thecounter-bore being slightly olf-set and substantially the length of saidstem. The collar it is formed with spaced openings 20 for receiving aspanner Wrench or the like for rotating the locking plug into engagementwith the core plug. As is to be understood, the stem I1 is machined withan ofiset corresponding to the counter-bore [9.

The face of the locking plug shown in Figure 4 of the drawing is formedwith arcuate shaped slots 2| and 22 respectively, for receiving the capscrews 23, which screws fit into threaded openings 24 formed in the coreplug 9. When the stem I1 is inserted into the counter-bore l9, cap

screws 23 will be placed through the slots 2| and 22 and partiallythreaded into the openings 24. This will serve to hold the members 9 andI5 loosely together so that both can be slipped onto the shaft at thesame time and always remain together but can be turned independentlywithin the range of the slots 2| and 22. As is to be understood, thelocation of the cap screws and range of the slots 2| and 22 will dependupon the distance required to rotate the locking plug for loosening itand the plug from the shaft.

If desired, an additional arcuate slot 25 may be formed in the collarwith a slotted portion 26 formed in the periphery of the stem H, theslotted portion permitting a more binding effect between the stem andthe counter-bore I9 when rotating the locking plug.

In the use of the device, after both the plug and the locking deviceattached thereto by the cap screws 23 have been slipped on the shaft 8,the plug 9 is screwed into the core with the use of a spanner wrench orthe like applied to the openings M. Then by use of a spanner wrenchapplied to the openings 20 in the locking plug [5, the locking devicewill be rotated without the plug turning until the stem I! has moved thelimit of the counter-bore I9 causing the plugs 9 and I5 to become lookedthrough friction to the shaft 8.

As is to beunderstood, the plugs 9 and I5 will be manufactured in sets,one for each end of the core and will be formed with a right-hand andleft-hand thread on one plug of each set. The plugs will be made ofdifferent sizes to accommodate their use with difierent sized cores andshafts.

Also it will be understood, of course, by those skilled in the art thatvariations in the hereinabove described device involving thesubstitution of substantial equivalents for the devices described areintended to be comprehended Within the spirit of the present inventionand that the invention is capable of extended application and is notconfined to the exact showing of the drawing nor to the preciseconstruction described and, therefore, such changes and modificationsmay be made therein as do not affect the spirit of the invention norexceed the scope thereof as expressed in the appended claim.

What is claimed is:

A device of the character described for securing paper rolls mounted ona core to a shaft,

- comprising, a plug having a central bore therethrough for disposingthe same on a shaft between said core and said shaft, a collar formedintegral with said plug, said plug being tapered and formed with anexternally tapered thread for engagement with said core, said collarhaving an off-set counter-bore formed therein, a locking plug engageableon said shaft within said counter-bore, said locking plug being formedwith a collar of substantially the same diameter as said first mentionedcollar, said second mentioned collar having arcuate spaced slots formedtherein, pins extending through said slots for loosely uniting saidplugs, and means formed in said collars for effecting rotation of saidplugs.

CHARLES M. RICHARDSON.

